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Controlling inbreeding by constraining the average relationship between parents of young bulls entering AI progeny test programs


, : Controlling inbreeding by constraining the average relationship between parents of young bulls entering AI progeny test programs. Journal of dairy science 85(9): 2376-2383

In breeding is known to impair the health, fertility, and productivity of dairy cattle and other livestock species. Mating programs can address inbreeding concerns on the farm, at least in the short term, but long-term control of inbreeding in a dairy population requires consideration of relationships between young bulls entering AI progeny test programs. The present study discusses an application of optimal contribution methodology to selection of young AI bulls in the five major US dairy breeds. Elite cows and active AI sires from the Ayrshire, Brown Swiss, Guernsey, Holstein, and Jersey breeds were considered as potential bull parents. Genetic merit of selected sires and dams was maximized subject to various constraints on the mean additive genetic relationship within the selected group. Relationships between selected parents can be reduced substantially relative to current levels, but the corresponding reduction in genetic merit may be large. This loss in genetic merit occurs due to lower selection intensity, although it is mainly a reflection of a larger number of bull parents (with progeny more evenly distributed among these parents), rather than selection of genetically inferior "outcross" parents that wouldn't otherwise have been considered. Selected parents were generally older and slightly less inbred than those that would have been chosen had inbreeding been ignored. Although severe restrictions on relationships can be costly, in terms of lost genetic progress, it appears that moderate constraints can keep relationships at a manageable level without a significant loss in genetic merit. Cooperation between breed associations and several competing AI companies may be required to facilitate implementation of this methodology in dispersed populations, but if this can be accomplished, prospects for achieving a balance between inbreeding and selection seem positive.

US$19.90

PMID: 12362471

DOI: 10.3168/jds.s0022-0302(02)74318-x


Other references

Nuti, M.; Agostini, M.; Albini, E.; Avsic-Zupanc, T.; Kraigher, A., 1992: Antibodies against the Hantaan virus in Italian ex-soldiers stationed in the Balkans during World War II. Annali di Igiene 4(1): 23-28

Agrimonti, C.; Pirondini, A.; Marmiroli, M.; Marmiroli, N., 2016: A quadruplex PCR (qxPCR) assay for adulteration in dairy products. This study describes the development of a quadruplex quantitative Real Time PCR (qxPCR) based on SYBR®GreenER chemistry, for rapid identification of DNA of cow, goat, sheep and buffalo in dairy products, and for quantification of cow DNA in these...

Cappellaro, P.; Hodges, J.S.; Havel, T.F.; Cory, D.G., 2006: Principles of control for decoherence-free subsystems. Decoherence-free subsystems (DFSs) are a powerful means of protecting quantum information against noise with known symmetry properties. Although Hamiltonians that can implement a universal set of logic gates on DFS encoded qubits without ever leav...

Angell, S.; Levings, J.; Neiman, A.; Asma, S.; Merritt, R., 2014: How Policy Makers Can Advance Cardiovascular Health. Scientific American 2014(Suppl Spec): 24-29

Capron, L., 1994: Diabetics are not atherosclerotics like non-diabetics. Journees Annuelles de Diabetologie de L'hotel-Dieu: 117-123

Wade, C.E., 2008: Hyperglycemia may alter cytokine production and phagocytosis by means other than hyperosmotic stress. In the previous issue of Critical Care, Otto and colleagues used in vitro studies to explore the theory that immunomodulation, by correction of hyperglycemia, may be a contributing factor to the reported efficacy of intensive insulin therapy (IIT)...

Garcia-Borreguero, D.; Odin, P.; Schwarz, C., 2004: Restless legs syndrome: an overview of the current understanding and management. Over the last few years, major progress in research has improved our understanding of the restless legs syndrome (RLS). Although frequently under-diagnosed, several epidemiological studies have estimated its prevalence in western countries at 4-10...

Richardson, P.H.; Black, N.J.; Justins, D.M.; Watson, R.J.D., 1999: The use of stop signals to reduce the pain and distress of patients undergoing a stressful medical procedure: An exploratory clinical study. The present study investigates stop signals and their effects on the pain and distress of patients undergoing a stressful medical procedure. Thirty-six chronic pain patients (17 men, 19 women) attending an out-patient operating theatre for diagnos...

Lieber, C.S., 2004: Relationships between nutrition, alcohol use, and liver disease. Many alcoholics are malnourished, either because they ingest too little of essential nutrients (e.g., carbohydrates, proteins, and vitamins) or because alcohol and its metabolism prevent the body from properly absorbing, digesting, and using those...

Desai H.K.; E.S.fany R.H.; Pelletier S.W., 1990: Isodelectine a new norditerpenoid alkaloid from delphinium vestitum. Isodelectine [3], a new norditerpenoid alkaloid, has been isolated from Delphinium vestitum. Its structure has been deduced from spectroscopic data and a chemical correlation with delvestine [1]. Anthranoyllcoctonine [4] was also isolated from thi...